GM BLOCK

[305chevy c-10]

never mind......did reserch ...377 not good for  street ...............400 with a 350 crank .......just thought i may save from having to purchase a $700 stroker kit .......hey will the cog belt setup also use a reverse rot water pump or not .....

[beastie_3]

i believe it just matters what the bore size is as far as 377 vs 383. Why is a stroker not good for the street?

[305chevy c-10]

more for high rpm setups ......383's are better for street nice torque ........i was just having brain farts ......thinking a 377 would be a lot cheaper........oh yeah .jim thanks for those pics with detailed info. .....i really learned something helpful ...............this is better than google 

[screamin86]

I believe a 377 is a stroked 350 with stock bore. Which means if you were to bore it .030 it would be a "383"

[beastie_3]

305, so you think a 377 is good for high RPMs and a 383 is good for street torque?

[TexasRed]

Well, a 350 block with a 3.76 stroke is like 378 (on the stock bore size of 4"). Traditionally the 400 block with a 350 crank is called the 377 (.030 over the stock 4.125 bore). And yes, because of the shorter strokes and large diameter bore, people think the 377 will rev pretty high and quicker than say a 400 or a 383 with the longer crank throw. It's all in how you build the motor. The 377 will be more expensive than a 383. Plus if you've got a 400 block, build that.

[screamin86]

That's right I knew it was 377or 378 but for some reason I 378 didn't look right at the time I figures it up. Lol

[305chevy c-10]

yeah its just something i read ....it basicly said a 377 is a high rpm engine

[CanadianC10]

A 377 is the same Idea as the 327 - 350 with a 307 crank .. short stroke is all that is benefit

[305chevy c-10]

does itmatter what size rods i use in a 383 build 5.7 or 6.00

[305chevy c-10]

found the answer .....6.00 are better more power.............does anything have to be done to my block to clear a 3.75 crank.............someone said something about notching the block near oilpan for crank clearance ......i think this was refer to old 383 when people used 400 cranks and ground down the mains to fit a 350 block mains .........before aftermarket started making them ready to install

[bobcooter]

A friend of mine was telling me about building a 358. He used the stock 350 crank with 6 inch rods. He said it made more torque than his 383.

[TexasRed]

You'll probably have to grind on the block some. I did with an aftermarket crank. Both the oil pan rails and a few small parts of the block. You'll also have to notch the oil pan gasket. I recommend getting a gasket set with a one piece oil pan gasket.

5.7 vs. 6.0 I don't think is going to make a hill of beans difference for the street. In fact the 6.0 rods may add quite a bit to the price as you the pistol selection is slimmer.

[VileZambonie]

Those 3 raised machined and tapped holes in the lifter valley do not mean it is a roller equipped engine. GM included the provisions in them all like that (86-87 up) even if they were not equipped with a roller cam. The only way to really tell if you have the roller set up is to actually see the retainer and lifters installed.

Let's help each other out or post nothing at all. K?

[Jim Rockford]

Think you are a bit late to the party, I covered the fact that the roller blocks could come and can use flat tappet cams.